@article{Kadushin2006,
author = {Kadushin, C. and Killworth, P.D. and Bernard, H.R. and Beveridge, A.A.},
title= {Scale-Up methods as applied to estimates of heroin use},
year = {2006},
doi = {10.1177/002204260603600209},
volume = {36},
number = {2},
pages = {417--440},
}